Learned how to use a pnematic nailer, and became a great painter.

They claimed the compressor was overworking, used an outdated refrigerant that’s no longer available, the indoor coil had a cracked pan, and the system was beyond repair.

Evaporator coils can also become clogged over a long period, also reducing air flow and adversely affecting the system.

Maybe they should just start putting out these wild fires, instead of waiting to call in the airplanes after they wait for them to get out of control.Heat pumps with buried coils would probably handle it better than above ground heat pumps.

Now you could keep 1 boiler and put in a coil in the ductwork and use it as emergency heat . 

Or would it be more cost-effective to replace just SEER condenser and evaporator coil for the AC?

It's the wood nailers along the 4 sides of this unit are all rotten. 

Well, it was not, the unit is VERY old, the coil is leaking (directly into the electric furnace, but that's another story, it too is about 30 years old).

Looks like one valley + five stacks/vents to flash = materials about $80.  130 ft of drip edge flashing at $50.  2 coils of nails at $60.  

Also, always change your unit's HVAC filters or you be going through heat exchangers, evaporator coils, and compressors more often.